Excerpt from Dielectric Constant, Power Factor, and Resistivity of Rubber and Gutta-Percha A rubber-sulphur mixture vulcanizes more readily if there has been added 1t0 it a small quantity of any one of a certain group of com: pounds called' accelerators. These accelerators. Are not merely catalysts since they may also markedly modify the nature and proper ties oi the resulting vulcanized rubber. By their use the time and temperature of vulcanization have less influence on the resulting product. Hence by employing accelerators a greater uniformity in vulcanized rubber can be obtained. For many purposes the properties of rubber can be improved by adding some inert material called a filler. Fillers maybe used in any proportion from 0 to. 90 per cent. The rubber, filler, and sulphur are mixed together before vulcanization. The. Vulcanizing process does not change the chemical nature of the filler. However, the mechanical and electrical properties of the rubber may be greatly modified by its presence. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.